Shojiko takechi



`July 11, 1933. s. TAKECHI lMETHOD FOR CONCRETE FILING Original Filed Feb. 20, 1928 i Y n wwm M INVENTOR BY LWQTTORNEY Reissued `luly 11, 1933"Y UNmi` srm's sHoJIno TARECHI, orvosAKa'vJArAN v l METHOD Fon CONCRETE PILINGJ Original No. 1,792,333, dated February 10, 1931, Serial "No. 255,731, led February 20, 1928, and.Y in Japan March 19, 1927. Application for reissue led October 25, 1932. SerialA No. 639,506.

This invention relates to a method for concrete piling and has for its object to obtain great stability and supporting ability of the individual piles while avoiding the expense of piles of uniform or substantially uniform large diameter or cross-,sectional dimensions.

In the accompanying drawing: l Figure 1 represents a vertical section illustrating in elevation a pile'as driven into the ground with the filling material shown in 'c of uniform size preferably equidistantly vertically spaced annular enlargements 3 each formed with. a tapering lower face or shoulder to facilitate the driving of the pile and' with an upper face preferably extending at right angles to the axis of the pile to serve as a supporting face or shoulder for the packs or iills l of sand and/or gravel 7.

In the practice of my method a preferably 'funnel shaped hopper 6, with an open bottom, is disposed on the ground surface 5 and the pile 2 is vdriven down through the hopper 6 until the lowest annular enlargement 3 has passed through said open bottom of said hopper, the opening in which is just large enough to allow the passage of the annular shoulders-3. When the pile 2 has been driven into the -ground to the degree stated, and preferably before the upper supporting face orshoulder of the lowest annular enlargement 3 passes below, lor appreciably below, the bottom of `the hopper 6, the latter .is filled with sand and/or gravel and is kept full continuously thereafter until the pile has been completely driven in. The sand and gravel 7, being fluent material, will flow under the action of gravity down through the bottom of the hopper 6 about the pile 2 between the enlargements, 3, and the'jarring action of the hammer 8 in driving thepile 2 will serve to aid in maintaining the flow of such sand and/or gravel Tand to pack the same about the pile 2 and is supported by the top or supporting faceor'shoulderof the saidl yof the pile 2.

lowest annular enlargement 3'into a pack or fill l until the second lowest annular enlargement passes into the open bottom of the hopper 6 and closes the same against the passage of vsand and/or gravel 7 therethrough until said second lowest annular enlargement 3 has moved downward until its upper supporting face or shoulder is below the bottom of the hopper 6, when the above action will be repeated, and so on until thedrivingof the pile 2 has been completed.

In this way the portions intervening between theA annular enlargements 3 are filled in with solid well packed fills or packs lA of a nature to contact with the opposed face of the bore 4 formed by the'driving ofthe pile 2 with its annular enlargements 3, and said packs or fills l together with the annular enlargements 3serve to maintain efficient frictional supporting contact with the opposed face of the bore whaiciaimiaf kl. The method of driving and packing piling comprising the employment of a pile having a-plurality of spaced enlargements, driving said pile by percussive means, ar-

ne.v 18,893

i910 4 through the length ranging asupply of iiu'ent solid illing mai terialclosely about said pile, wherebyl the filling material will flow down the hole about the pile as oneof said enlargements moves K downward below the topv of said hole, filling the space V.above .said enlargement and be- Y'tween said pile v.and the wall ofsaid hole,

until the succeeding enlargement temporasaid' pile.

2. The method of driving and packing pilingcomprising the employment of a pile .85 rily closes thetop of said hole, the vibration y having a plurality of spaced annular enlargements of-uniforni cross-sectional' size kand shape, each said enlargement having a 'tapering lower face and an upper annular face forming a supporting shoulder for filling material, driving said pile at a substantially uniform` rate of travel by percussivev i means, Aarranging a supply of fluent solid illi l ing material suohras Vgravel closely about f vsaid pile, whereby thefilling material'will flow down the hole bored by the pile as one' eeedingy enlargement temporarily closes the( top vof said hole, the vibration set up by the 35 percussive driving means serving to promote the flow of filling material andtendingto :fv

pack it between said wall and said pile;

or y 18,893-,

7K3.' The method of driving and packing piling comprising the employment of a pile having -anL enlargement, peroussively driv-i ing'said pile, the said enlargement forming a hole about-said pile as it is drivenyand said'pile and above. saidenlargement-a's Said pile is driven. p'

In testimony .whereof I have signed this .'speciicatio'ntliis 21st day of October, 1932.

sHoJIpRo i TAKECHI.V

i flowing lining-material linto the holejabout Veo u l13o. 

